This is not an option we support for several reasons. a) Many of our add-ons require very complex back-end systems ranging from database software, cluster management, and graphics processing software to our real-time 24x7 monitoring software, and more. b) Our add-ons are designed to operate from a cluster of fail-safe servers, to provide scalability and reliability that would be very difficult to install on alternative servers. c) The Xara website add-ons are designed to be quick and supremely easy to use so they can be integrated into any website in seconds. This couldn't be guaranteed if we provided the software to be installed on your web servers.
By hosting the add-ons on our servers, but incorporating them into your website we get the best of both worlds. Ease of use, and the scalability and reliability of a our server cluster.